Defer plugin.Version pointer receiver change to v5

[camilamacedo86]

This issue tracks PR #4733, which changes plugin.Version methods to use pointer receivers.

The change is breaking for downstream consumers like Operator SDK, which rely on value-based usage.

We should defer this until kubebuilder v5, where breaking changes are allowed.
See: #4733 (comment)

[camilamacedo86]

@kersten

When we have enough requirements that justify a kubebuilder v5. x, we can do this one.

[kersten]

Great! In that case, we should refactor all mixed uses of pointer and value receivers to consistently use pointer receivers throughout the codebase.